diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 59e2f147e1..8d6d9baca3 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -3549,7 +3549,7 @@ static int32_t setTableCondForSTableQuery(SQueryInfo* pQueryInfo, const char* ac
     return TSDB_CODE_SUCCESS;
   }
 
-  SStringBuilder sb1;
+  SStringBuilder sb1 = { 0 };
   taosStringBuilderAppendStringLen(&sb1, QUERY_COND_REL_PREFIX_IN, QUERY_COND_REL_PREFIX_IN_LEN);
 
   char db[TSDB_TABLE_ID_LEN] = {0};
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index f6d20f69ac..21f6f9d390 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -697,7 +697,7 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   pQueryMsg->slidingTimeUnit = pQueryInfo->slidingTimeUnit;
   pQueryMsg->numOfGroupCols = htons(pQueryInfo->groupbyExpr.numOfGroupCols);
   pQueryMsg->numOfTags      = htonl(numOfTags);
-  
+  pQueryMsg->tagNameRelType = htons(pQueryInfo->tagCond.relType);
   pQueryMsg->queryType      = htons(pQueryInfo->type);
   
   size_t numOfOutput = tscSqlExprNumOfExprs(pQueryInfo);
@@ -916,6 +916,14 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     }
   }
   
+  if (pQueryInfo->tagCond.tbnameCond.cond == NULL) {
+    *pMsg = 0;
+    pMsg++;
+  } else {
+    strcpy(pMsg, pQueryInfo->tagCond.tbnameCond.cond);
+    pMsg += strlen(pQueryInfo->tagCond.tbnameCond.cond) + 1;
+  }
+
   // tbname in/like query expression should be sent to mgmt node
   msgLen = pMsg - pStart;
 
@@ -1848,7 +1856,7 @@ int tscBuildHeartBeatMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   pCmd->msgType = TSDB_MSG_TYPE_CM_HEARTBEAT;
 
   assert(msgLen + minMsgSize() <= size);
-  return msgLen;
+  return TSDB_CODE_SUCCESS;
 }
 
 int tscProcessTableMetaRsp(SSqlObj *pSql) {
diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index 216de90598..043e58cb35 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -32,6 +32,9 @@ extern "C" {
 #define TSKEY int64_t
 #endif
 
+// this data type is internally used only in 'in' query to hold the values
+#define TSDB_DATA_TYPE_ARRAY      (TSDB_DATA_TYPE_NCHAR + 1)
+
 // Bytes for each type.
 extern const int32_t TYPE_BYTES[11];
 // TODO: replace and remove code below
@@ -141,16 +144,17 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 #define TSDB_RELATION_GREATER_EQUAL 5
 #define TSDB_RELATION_NOT_EQUAL   6
 #define TSDB_RELATION_LIKE        7
+#define TSDB_RELATION_IN          8
 
-#define TSDB_RELATION_AND         8
-#define TSDB_RELATION_OR          9
-#define TSDB_RELATION_NOT         10
+#define TSDB_RELATION_AND         9
+#define TSDB_RELATION_OR          10
+#define TSDB_RELATION_NOT         11
 
-#define TSDB_BINARY_OP_ADD        11
-#define TSDB_BINARY_OP_SUBTRACT   12
-#define TSDB_BINARY_OP_MULTIPLY   13
-#define TSDB_BINARY_OP_DIVIDE     14
-#define TSDB_BINARY_OP_REMAINDER  15
+#define TSDB_BINARY_OP_ADD        12
+#define TSDB_BINARY_OP_SUBTRACT   13
+#define TSDB_BINARY_OP_MULTIPLY   14
+#define TSDB_BINARY_OP_DIVIDE     15
+#define TSDB_BINARY_OP_REMAINDER  16
 #define TSDB_USERID_LEN           9
 #define TS_PATH_DELIMITER_LEN     1
 
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index dd6dc52242..a72253d846 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -470,6 +470,7 @@ typedef struct {
   int64_t     offset;
   uint16_t    queryType;        // denote another query process
   int16_t     numOfOutput;  // final output columns numbers
+  int16_t     tagNameRelType;   // relation of tag criteria and tbname criteria
   int16_t     interpoType;      // interpolate type
   uint64_t    defaultVal;       // default value array list
 
diff --git a/src/inc/tsdb.h b/src/inc/tsdb.h
index 481e05c102..e5c884c819 100644
--- a/src/inc/tsdb.h
+++ b/src/inc/tsdb.h
@@ -279,8 +279,17 @@ SArray *tsdbGetTableList(TsdbQueryHandleT *pQueryHandle);
  * @param pTagCond. tag query condition
  *
  */
-int32_t tsdbQueryByTagsCond(TsdbRepoT *tsdb, int64_t uid, const char *pTagCond, size_t len, STableGroupInfo *pGroupList,
-                      SColIndex *pColIndex, int32_t numOfCols);
+int32_t tsdbQueryByTagsCond(
+  TsdbRepoT *tsdb,
+  int64_t uid,
+  const char *pTagCond,
+  size_t len,
+  int16_t tagNameRelType,
+  const char* tbnameCond,
+  STableGroupInfo *pGroupList,
+  SColIndex *pColIndex,
+  int32_t numOfCols
+  );
 
 int32_t tsdbGetOneTableGroup(TsdbRepoT *tsdb, int64_t uid, STableGroupInfo *pGroupInfo);
 
diff --git a/src/query/inc/qast.h b/src/query/inc/qast.h
index f3484509f8..7de1e5be66 100644
--- a/src/query/inc/qast.h
+++ b/src/query/inc/qast.h
@@ -91,7 +91,8 @@ uint8_t getBinaryExprOptr(SSQLToken *pToken);
 
 SBuffer exprTreeToBinary(tExprNode* pExprTree);
 
-int32_t exprTreeFromBinary(const void* pBuf, size_t size, tExprNode** pExprNode);
+tExprNode* exprTreeFromBinary(const void* pBuf, size_t size);
+tExprNode* exprTreeFromTableName(const char* tbnameCond);
 
 #ifdef __cplusplus
 }
diff --git a/src/query/inc/tvariant.h b/src/query/inc/tvariant.h
index 7ed5aa8dbe..9e11e6c294 100644
--- a/src/query/inc/tvariant.h
+++ b/src/query/inc/tvariant.h
@@ -17,6 +17,7 @@
 #define TDENGINE_TVARIANT_H
 
 #include "tstoken.h"
+#include "tarray.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -31,6 +32,7 @@ typedef struct tVariant {
     double   dKey;
     char *   pz;
     wchar_t *wpz;
+    SArray  *arr; // only for 'in' query to hold value list, not value for a field
   };
 } tVariant;
 
diff --git a/src/query/src/qast.c b/src/query/src/qast.c
index 14f340b3d3..b262429e5d 100644
--- a/src/query/src/qast.c
+++ b/src/query/src/qast.c
@@ -30,6 +30,7 @@
 #include "tarray.h"
 #include "tskiplist.h"
 #include "queryLog.h"
+#include "tsdbMain.h"
 
 /*
  *
@@ -521,38 +522,48 @@ static int32_t setQueryCond(tQueryInfo *queryColInfo, SQueryCond* pCond) {
   if (optr == TSDB_RELATION_GREATER || optr == TSDB_RELATION_GREATER_EQUAL ||
       optr == TSDB_RELATION_EQUAL || optr == TSDB_RELATION_NOT_EQUAL) {
     pCond->start = calloc(1, sizeof(tVariant));
-    
     tVariantAssign(&pCond->start->v, &queryColInfo->q);
     pCond->start->optr = queryColInfo->optr;
+
   } else if (optr == TSDB_RELATION_LESS || optr == TSDB_RELATION_LESS_EQUAL) {
     pCond->end = calloc(1, sizeof(tVariant));
-    
     tVariantAssign(&pCond->end->v, &queryColInfo->q);
     pCond->end->optr = queryColInfo->optr;
+
+  } else if (optr == TSDB_RELATION_IN) {
+    printf("relation is in\n");
+
+  } else if (optr == TSDB_RELATION_LIKE) {
+    printf("relation is like\n");
+
   }
   
   return TSDB_CODE_SUCCESS;
 }
 
-static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t type, SArray* result) {
+static void tQueryIndexColumn(SSkipList* pSkipList, tQueryInfo* pQueryInfo, SArray* result) {
   SSkipListIterator* iter = NULL;
-  
-  if (pCond->start != NULL) {
-    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &pCond->start->v.i64Key, type, TSDB_ORDER_ASC);
+  int32_t type = pQueryInfo->q.nType;
+
+  SQueryCond cond = { 0 };
+  setQueryCond(pQueryInfo, &cond);
+
+  if (cond.start != NULL) {
+    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &cond.start->v.i64Key, type, TSDB_ORDER_ASC);
   } else {
-    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &pCond->end->v.i64Key, type, TSDB_ORDER_DESC);
+    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &cond.end->v.i64Key, type, TSDB_ORDER_DESC);
   }
   
   __compar_fn_t func = getComparFunc(pSkipList->keyInfo.type, type, 0);
   
-  if (pCond->start != NULL) {
-    int32_t optr = pCond->start->optr;
+  if (cond.start != NULL) {
+    int32_t optr = cond.start->optr;
     
     if (optr == TSDB_RELATION_EQUAL) {
       while(tSkipListIterNext(iter)) {
         SSkipListNode* pNode = tSkipListIterGet(iter);
 
-        int32_t ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->start->v.i64Key);
+        int32_t ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &cond.start->v.i64Key);
         if (ret == 0) {
           taosArrayPush(result, SL_GET_NODE_DATA(pNode));
         } else {
@@ -567,7 +578,7 @@ static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t ty
         SSkipListNode* pNode = tSkipListIterGet(iter);
     
         if (comp) {
-          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->start->v.i64Key);
+          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &cond.start->v.i64Key);
           assert(ret >= 0);
         }
         
@@ -584,7 +595,7 @@ static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t ty
       assert(0);
     }
   } else {
-    int32_t optr = pCond->end->optr;
+    int32_t optr = cond.end->optr;
     
     if (optr == TSDB_RELATION_LESS || optr == TSDB_RELATION_LESS_EQUAL) {
       bool comp = true;
@@ -594,7 +605,7 @@ static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t ty
         SSkipListNode* pNode = tSkipListIterGet(iter);
       
         if (comp) {
-          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->end->v.i64Key);
+          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &cond.end->v.i64Key);
           assert(ret <= 0);
         }
         
@@ -620,6 +631,8 @@ static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t ty
 //  DEFAULT_COMP(p1, p2);
 //}
 
+// develop_old mgmtSTableQuery for merge & intersect
+
 int32_t merge(SArray *pLeft, SArray *pRight, SArray *pFinalRes) {
 //  assert(pFinalRes->pRes == 0);
 //
@@ -770,19 +783,55 @@ static void exprTreeTraverseImpl(tExprNode *pExpr, SArray *pResult, SBinaryFilte
   taosArrayCopy(pResult, array);
 }
 
-static void tSQLBinaryTraverseOnSkipList(tExprNode *pExpr, SArray *pResult, SSkipList *pSkipList,
-    SBinaryFilterSupp *param) {
+
+static void tSQLBinaryTraverseOnSkipList(
+  tExprNode *pExpr,
+  SArray *pResult,
+  SSkipList *pSkipList,
+  SBinaryFilterSupp *param
+) {
   SSkipListIterator* iter = tSkipListCreateIter(pSkipList);
 
   while (tSkipListIterNext(iter)) {
     SSkipListNode *pNode = tSkipListIterGet(iter);
-    
     if (filterItem(pExpr, pNode, param)) {
       taosArrayPush(pResult, SL_GET_NODE_DATA(pNode));
     }
   }
+  tSkipListDestroyIter(iter);
 }
 
+
+
+static void tQueryIndexlessColumn(SSkipList* pSkipList, tQueryInfo* pQueryInfo, SArray* result) {
+  SSkipListIterator* iter = tSkipListCreateIter(pSkipList);
+
+  while (tSkipListIterNext(iter)) {
+    bool addToResult = false;
+
+    SSkipListNode *pNode = tSkipListIterGet(iter);
+    STable* table = *(STable**) SL_GET_NODE_DATA(pNode);
+
+    if (pQueryInfo->colIndex == TSDB_TBNAME_COLUMN_INDEX) {
+      if (pQueryInfo->optr == TSDB_RELATION_IN) {
+        addToResult = pQueryInfo->compare(table->name, pQueryInfo->q.arr);
+      } else if(pQueryInfo->optr == TSDB_RELATION_LIKE) {
+        addToResult = !pQueryInfo->compare(table->name, pQueryInfo->q.pz);
+      }
+    } else {
+      // TODO: other columns
+    }
+
+    if (addToResult) {
+      taosArrayPush(result, (void*)&table);
+    }
+  }
+
+  tSkipListDestroyIter(iter);
+}
+
+
+
 // post-root order traverse syntax tree
 void tExprTreeTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, SBinaryFilterSupp *param) {
   if (pExpr == NULL) {
@@ -792,95 +841,99 @@ void tExprTreeTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, S
   tExprNode *pLeft  = pExpr->_node.pLeft;
   tExprNode *pRight = pExpr->_node.pRight;
 
-  // recursive traverse left child branch
-  if (pLeft->nodeType == TSQL_NODE_EXPR || pRight->nodeType == TSQL_NODE_EXPR) {
-    uint8_t weight = pLeft->_node.hasPK + pRight->_node.hasPK;
-
-    if (weight == 0 && taosArrayGetSize(result) > 0 && pSkipList == NULL) {
-      /**
-       * Perform the filter operation based on the initial filter result, which is obtained from filtering from index.
-       * Since no index presented, the filter operation is done by scan all elements in the result set.
-       *
-       * if the query is a high selectivity filter, only small portion of meters are retrieved.
-       */
-      exprTreeTraverseImpl(pExpr, result, param);
-    } else if (weight == 0) {
-      /**
-       * apply the hierarchical expression to every node in skiplist for find the qualified nodes
-       */
-      assert(taosArrayGetSize(result) == 0);
-      tSQLBinaryTraverseOnSkipList(pExpr, result, pSkipList, param);
-    } else if (weight == 2 || (weight == 1 && pExpr->_node.optr == TSDB_RELATION_OR)) {
-      SArray* rLeft  = taosArrayInit(10, POINTER_BYTES);
-      SArray* rRight = taosArrayInit(10, POINTER_BYTES);
-
-      tExprTreeTraverse(pLeft, pSkipList, rLeft, param);
-      tExprTreeTraverse(pRight, pSkipList, rRight, param);
-
-      if (pExpr->_node.optr == TSDB_RELATION_AND) {  // CROSS
-        intersect(rLeft, rRight, result);
-      } else if (pExpr->_node.optr == TSDB_RELATION_OR) {  // or
-        merge(rLeft, rRight, result);
-      } else {
-        assert(false);
-      }
-
-      taosArrayDestroy(rLeft);
-      taosArrayDestroy(rRight);
-    } else {
-      /*
-       * (weight == 1 && pExpr->nSQLBinaryOptr == TSDB_RELATION_AND) is handled here
-       *
-       * first, we filter results based on the skiplist index, which is the initial filter stage,
-       * then, we conduct the secondary filter operation based on the result from the initial filter stage.
-       */
-      assert(pExpr->_node.optr == TSDB_RELATION_AND);
-
-      tExprNode *pFirst = NULL;
-      tExprNode *pSecond = NULL;
-      if (pLeft->_node.hasPK == 1) {
-        pFirst = pLeft;
-        pSecond = pRight;
-      } else {
-        pFirst = pRight;
-        pSecond = pLeft;
-      }
-
-      assert(pFirst != pSecond && pFirst != NULL && pSecond != NULL);
-
-      // we filter the result based on the skiplist index in the first place
-      tExprTreeTraverse(pFirst, pSkipList, result, param);
-
-      /*
-       * recursively perform the filter operation based on the initial results,
-       * So, we do not set the skip list index as a parameter
-       */
-      tExprTreeTraverse(pSecond, NULL, result, param);
-    }
-  } else {  // column project
+  // column project
+  if (pLeft->nodeType != TSQL_NODE_EXPR && pRight->nodeType != TSQL_NODE_EXPR) {
     assert(pLeft->nodeType == TSQL_NODE_COL && pRight->nodeType == TSQL_NODE_VALUE);
 
     param->setupInfoFn(pExpr, param->pExtInfo);
     if (pSkipList == NULL) {
       tSQLListTraverseOnResult(pExpr, param->fp, result);
-    } else {
-      tQueryInfo *pQueryInfo = pExpr->_node.info;
-      
-      if (pQueryInfo->colIndex == 0 && pQueryInfo->optr != TSDB_RELATION_LIKE) {
-        SQueryCond cond = {0};
-        /*int32_t ret = */ setQueryCond(pQueryInfo, &cond);
-        tQueryOnSkipList(pSkipList, &cond, pQueryInfo->q.nType, result);
-      } else {
-        /* Brutal force scan the whole skip list to find the appropriate result,
-         * since the filter is not applied to indexed column.
-         */
-        assert(0);
-//    result->num = tSkipListIterateList(pSkipList, (tSkipListNode ***)&result->pRes, fp, queryColInfo);
-      }
+      return;
     }
+
+    tQueryInfo *pQueryInfo = pExpr->_node.info;
+    if (pQueryInfo->colIndex == 0 && pQueryInfo->optr != TSDB_RELATION_LIKE) {
+      tQueryIndexColumn(pSkipList, pQueryInfo, result);
+    } else {
+      tQueryIndexlessColumn(pSkipList, pQueryInfo, result);
+    }
+
+    return;
   }
+
+  // recursive traverse left child branch
+  uint8_t weight = pLeft->_node.hasPK + pRight->_node.hasPK;
+
+  if (weight == 0 ) {
+    if (taosArrayGetSize(result) > 0 && pSkipList == NULL) {
+    /**
+     * Perform the filter operation based on the initial filter result, which is obtained from filtering from index.
+     * Since no index presented, the filter operation is done by scan all elements in the result set.
+     *
+     * if the query is a high selectivity filter, only small portion of meters are retrieved.
+     */
+      exprTreeTraverseImpl(pExpr, result, param);
+    } else {
+      /**
+       * apply the hierarchical expression to every node in skiplist for find the qualified nodes
+       */
+      assert(taosArrayGetSize(result) == 0);
+      tSQLBinaryTraverseOnSkipList(pExpr, result, pSkipList, param);
+    }
+    return;
+  }
+  
+  if (weight == 2 || (weight == 1 && pExpr->_node.optr == TSDB_RELATION_OR)) {
+    SArray* rLeft  = taosArrayInit(10, POINTER_BYTES);
+    SArray* rRight = taosArrayInit(10, POINTER_BYTES);
+
+    tExprTreeTraverse(pLeft, pSkipList, rLeft, param);
+    tExprTreeTraverse(pRight, pSkipList, rRight, param);
+
+    if (pExpr->_node.optr == TSDB_RELATION_AND) {  // CROSS
+      intersect(rLeft, rRight, result);
+    } else if (pExpr->_node.optr == TSDB_RELATION_OR) {  // or
+      merge(rLeft, rRight, result);
+    } else {
+      assert(false);
+    }
+
+    taosArrayDestroy(rLeft);
+    taosArrayDestroy(rRight);
+    return;
+  }
+
+  /*
+    * (weight == 1 && pExpr->nSQLBinaryOptr == TSDB_RELATION_AND) is handled here
+    *
+    * first, we filter results based on the skiplist index, which is the initial filter stage,
+    * then, we conduct the secondary filter operation based on the result from the initial filter stage.
+    */
+  assert(pExpr->_node.optr == TSDB_RELATION_AND);
+
+  tExprNode *pFirst = NULL;
+  tExprNode *pSecond = NULL;
+  if (pLeft->_node.hasPK == 1) {
+    pFirst = pLeft;
+    pSecond = pRight;
+  } else {
+    pFirst = pRight;
+    pSecond = pLeft;
+  }
+
+  assert(pFirst != pSecond && pFirst != NULL && pSecond != NULL);
+
+  // we filter the result based on the skiplist index in the first place
+  tExprTreeTraverse(pFirst, pSkipList, result, param);
+
+  /*
+    * recursively perform the filter operation based on the initial results,
+    * So, we do not set the skip list index as a parameter
+    */
+  tExprTreeTraverse(pSecond, NULL, result, param);
 }
 
+
 void tSQLBinaryExprCalcTraverse(tExprNode *pExprs, int32_t numOfRows, char *pOutput, void *param, int32_t order,
                                 char *(*getSourceDataBlock)(void *, char *, int32_t)) {
   if (pExprs == NULL) {
@@ -1032,49 +1085,143 @@ SBuffer exprTreeToBinary(tExprNode* pExprTree) {
   return buf;
 }
 
-static void exprTreeFromBinaryImpl(tExprNode** pExprTree, SBuffer* pBuf) {
+static tExprNode* exprTreeFromBinaryImpl(SBuffer* pBuf) {
   tExprNode* pExpr = calloc(1, sizeof(tExprNode));
-  tbufReadToBuffer(pBuf, &pExpr->nodeType, sizeof(pExpr->nodeType));
+  pExpr->nodeType = tbufReadUint8(pBuf);
   
   if (pExpr->nodeType == TSQL_NODE_VALUE) {
     tVariant* pVal = calloc(1, sizeof(tVariant));
+    if (pVal == NULL) {
+      // TODO:
+    }
+    pExpr->pVal = pVal;
   
-    tbufReadToBuffer(pBuf, &pVal->nType, sizeof(pVal->nType));
+    pVal->nType = tbufReadUint32(pBuf);
     if (pVal->nType == TSDB_DATA_TYPE_BINARY) {
       tbufReadToBuffer(pBuf, &pVal->nLen, sizeof(pVal->nLen));
       pVal->pz = calloc(1, pVal->nLen + 1);
       tbufReadToBuffer(pBuf, pVal->pz, pVal->nLen);
     } else {
-      tbufReadToBuffer(pBuf, &pVal->pz, sizeof(pVal->i64Key));
+      pVal->i64Key = tbufReadInt64(pBuf);
     }
     
-    pExpr->pVal = pVal;
   } else if (pExpr->nodeType == TSQL_NODE_COL) {
     SSchema* pSchema = calloc(1, sizeof(SSchema));
-    tbufReadToBuffer(pBuf, &pSchema->colId, sizeof(pSchema->colId));
-    tbufReadToBuffer(pBuf, &pSchema->bytes, sizeof(pSchema->bytes));
-    tbufReadToBuffer(pBuf, &pSchema->type, sizeof(pSchema->type));
-    
+    if (pSchema == NULL) {
+      // TODO:
+    }
+    pExpr->pSchema = pSchema;
+
+    pSchema->colId = tbufReadInt16(pBuf);
+    pSchema->bytes = tbufReadInt16(pBuf);
+    pSchema->type = tbufReadUint8(pBuf);
     tbufReadToString(pBuf, pSchema->name, TSDB_COL_NAME_LEN);
     
-    pExpr->pSchema = pSchema;
   } else if (pExpr->nodeType == TSQL_NODE_EXPR) {
-    tbufReadToBuffer(pBuf, &pExpr->_node.optr, sizeof(pExpr->_node.optr));
-    tbufReadToBuffer(pBuf, &pExpr->_node.hasPK, sizeof(pExpr->_node.hasPK));
-  
-    exprTreeFromBinaryImpl(&pExpr->_node.pLeft, pBuf);
-    exprTreeFromBinaryImpl(&pExpr->_node.pRight, pBuf);
+    pExpr->_node.optr = tbufReadUint8(pBuf);
+    pExpr->_node.hasPK = tbufReadUint8(pBuf);
+    pExpr->_node.pLeft = exprTreeFromBinaryImpl(pBuf);
+    pExpr->_node.pRight = exprTreeFromBinaryImpl(pBuf);
     
     assert(pExpr->_node.pLeft != NULL && pExpr->_node.pRight != NULL);
   }
   
-  *pExprTree = pExpr;
+  return pExpr;
 }
 
-int32_t exprTreeFromBinary(const void* pBuf, size_t size, tExprNode** pExprNode) {
+tExprNode* exprTreeFromBinary(const void* pBuf, size_t size) {
+  if (size == 0) {
+    return NULL;
+  }
   SBuffer rbuf = {0};
-  /*int32_t code =*/ tbufBeginRead(&rbuf, pBuf, size);
-  exprTreeFromBinaryImpl(pExprNode, &rbuf);
-  return TSDB_CODE_SUCCESS;
+  tbufBeginRead(&rbuf, pBuf, size);
+  return exprTreeFromBinaryImpl(&rbuf);
 }
 
+tExprNode* exprTreeFromTableName(const char* tbnameCond) {
+  if (!tbnameCond) {
+    return NULL;
+  }
+
+  tExprNode* expr = calloc(1, sizeof(tExprNode));
+  if (expr == NULL) {
+    // TODO:
+  }
+  expr->nodeType = TSQL_NODE_EXPR;
+
+  tExprNode* left = calloc(1, sizeof(tExprNode));
+  if (left == NULL) {
+    // TODO:
+  }
+  expr->_node.pLeft = left;
+
+  left->nodeType = TSQL_NODE_COL;
+  SSchema* pSchema = calloc(1, sizeof(SSchema));
+  if (pSchema == NULL) {
+    // TODO:
+  }
+  left->pSchema = pSchema;
+
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  pSchema->bytes = TSDB_TABLE_NAME_LEN;
+  strcpy(pSchema->name, TSQL_TBNAME_L);
+  pSchema->colId = -1;
+
+  tExprNode* right = calloc(1, sizeof(tExprNode));
+  if (right == NULL) {
+    // TODO
+  }
+  expr->_node.pRight = right;
+
+  if (strncmp(tbnameCond, QUERY_COND_REL_PREFIX_LIKE, QUERY_COND_REL_PREFIX_LIKE_LEN) == 0) {
+    right->nodeType = TSQL_NODE_VALUE;
+    expr->_node.optr = TSDB_RELATION_LIKE;
+    tVariant* pVal = calloc(1, sizeof(tVariant));
+    if (pVal == NULL) {
+      // TODO:
+    }
+    right->pVal = pVal;
+    pVal->nType = TSDB_DATA_TYPE_BINARY;
+    size_t len = strlen(tbnameCond + QUERY_COND_REL_PREFIX_LIKE_LEN) + 1;
+    pVal->pz = malloc(len);
+    if (pVal->pz == NULL) {
+      // TODO:
+    }
+    memcpy(pVal->pz, tbnameCond + QUERY_COND_REL_PREFIX_LIKE_LEN, len);
+    pVal->nLen = (int32_t)len;
+
+  } else if (strncmp(tbnameCond, QUERY_COND_REL_PREFIX_IN, QUERY_COND_REL_PREFIX_IN_LEN) == 0) {
+    right->nodeType = TSQL_NODE_VALUE;
+    expr->_node.optr = TSDB_RELATION_IN;
+    tVariant* pVal = calloc(1, sizeof(tVariant));
+    if (pVal == NULL) {
+      // TODO:
+    }
+    right->pVal = pVal;
+    pVal->nType = TSDB_DATA_TYPE_ARRAY;
+    pVal->arr = taosArrayInit(2, sizeof(char*));
+
+    const char* cond = tbnameCond + QUERY_COND_REL_PREFIX_IN_LEN;
+    for (const char *e = cond; *e != 0; e++) {
+      if (*e == TS_PATH_DELIMITER[0]) {
+        cond = e + 1;
+      } else if (*e == ',') {
+        size_t len = e - cond + 1;
+        char* p = malloc( len );
+        memcpy(p, cond, len);
+        p[len - 1] = 0;
+        cond += len;
+        taosArrayPush(pVal->arr, &p);
+      }
+    }
+
+    if (*cond != 0) {
+        char* p = strdup( cond );
+        taosArrayPush(pVal->arr, &p);
+    }
+
+    taosArraySortString(pVal->arr);
+  }
+
+  return expr;
+}
\ No newline at end of file
diff --git a/src/query/src/queryExecutor.c b/src/query/src/queryExecutor.c
index 1cb7918ed5..9b410ce1e5 100644
--- a/src/query/src/queryExecutor.c
+++ b/src/query/src/queryExecutor.c
@@ -5280,7 +5280,7 @@ static char *createTableIdList(SQueryTableMsg *pQueryMsg, char *pMsg, SArray **p
  * @return
  */
 static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList, SSqlFuncMsg ***pExpr,
-                               char **tagCond, SColIndex **groupbyCols, SColumnInfo** tagCols) {
+                               char **tagCond, char** tbnameCond, SColIndex **groupbyCols, SColumnInfo** tagCols) {
   pQueryMsg->numOfTables = htonl(pQueryMsg->numOfTables);
 
   pQueryMsg->window.skey = htobe64(pQueryMsg->window.skey);
@@ -5293,6 +5293,7 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
   pQueryMsg->order = htons(pQueryMsg->order);
   pQueryMsg->orderColId = htons(pQueryMsg->orderColId);
   pQueryMsg->queryType = htons(pQueryMsg->queryType);
+  pQueryMsg->tagNameRelType = htons(pQueryMsg->tagNameRelType);
 
   pQueryMsg->numOfCols = htons(pQueryMsg->numOfCols);
   pQueryMsg->numOfOutput = htons(pQueryMsg->numOfOutput);
@@ -5436,13 +5437,6 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
     pMsg += sizeof(int64_t) * pQueryMsg->numOfOutput;
   }
 
-  // the tag query condition expression string is located at the end of query msg
-  if (pQueryMsg->tagCondLen > 0) {
-    *tagCond = calloc(1, pQueryMsg->tagCondLen);
-    memcpy(*tagCond, pMsg, pQueryMsg->tagCondLen);
-    pMsg += pQueryMsg->tagCondLen;
-  }
-  
   if (pQueryMsg->numOfTags > 0) {
     (*tagCols) = calloc(1, sizeof(SColumnInfo) * pQueryMsg->numOfTags);
     for (int32_t i = 0; i < pQueryMsg->numOfTags; ++i) {
@@ -5454,9 +5448,24 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
       pTagCol->numOfFilters = 0;
       
       (*tagCols)[i] = *pTagCol;
+      pMsg += sizeof(SColumnInfo);
     }
   }
 
+  // the tag query condition expression string is located at the end of query msg
+  if (pQueryMsg->tagCondLen > 0) {
+    *tagCond = calloc(1, pQueryMsg->tagCondLen);
+    memcpy(*tagCond, pMsg, pQueryMsg->tagCondLen);
+    pMsg += pQueryMsg->tagCondLen;
+  }
+  
+  if (*pMsg != 0) {
+    size_t len = strlen(pMsg) + 1;
+    *tbnameCond = malloc(len);
+    strcpy(*tbnameCond, pMsg);
+    pMsg += len;
+  }
+
   qTrace("qmsg:%p query on %d table(s), qrange:%" PRId64 "-%" PRId64
          ", numOfGroupbyTagCols:%d, ts order:%d, "
          "outputCols:%d, numOfCols:%d, interval:%d" PRId64 ", fillType:%d, comptsLen:%d, limit:%" PRId64
@@ -6054,13 +6063,13 @@ int32_t qCreateQueryInfo(void *tsdb, SQueryTableMsg *pQueryMsg, qinfo_t *pQInfo)
 
   int32_t code = TSDB_CODE_SUCCESS;
 
-  char *        tagCond = NULL;
+  char *        tagCond = NULL, *tbnameCond = NULL;
   SArray *      pTableIdList = NULL;
   SSqlFuncMsg **pExprMsg = NULL;
   SColIndex *   pGroupColIndex = NULL;
   SColumnInfo*  pTagColumnInfo = NULL;
 
-  if ((code = convertQueryMsg(pQueryMsg, &pTableIdList, &pExprMsg, &tagCond, &pGroupColIndex, &pTagColumnInfo)) !=
+  if ((code = convertQueryMsg(pQueryMsg, &pTableIdList, &pExprMsg, &tagCond, &tbnameCond, &pGroupColIndex, &pTagColumnInfo)) !=
          TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -6103,7 +6112,7 @@ int32_t qCreateQueryInfo(void *tsdb, SQueryTableMsg *pQueryMsg, qinfo_t *pQInfo)
     }
     
     // todo handle the error
-    /*int32_t ret =*/tsdbQueryByTagsCond(tsdb, id->uid, tagCond, pQueryMsg->tagCondLen, &groupInfo, pGroupColIndex,
+    /*int32_t ret =*/tsdbQueryByTagsCond(tsdb, id->uid, tagCond, pQueryMsg->tagCondLen, pQueryMsg->tagNameRelType, tbnameCond, &groupInfo, pGroupColIndex,
                                          numOfGroupByCols);
     if (groupInfo.numOfTables == 0) {  // no qualified tables no need to do query
       code = TSDB_CODE_SUCCESS;
@@ -6126,6 +6135,8 @@ int32_t qCreateQueryInfo(void *tsdb, SQueryTableMsg *pQueryMsg, qinfo_t *pQInfo)
   code = initQInfo(pQueryMsg, tsdb, *pQInfo, isSTableQuery);
 
 _query_over:
+  tfree(tagCond);
+  tfree(tbnameCond);
   taosArrayDestroy(pTableIdList);
   
   // if failed to add ref for all meters in this query, abort current query
diff --git a/src/query/src/tvariant.c b/src/query/src/tvariant.c
index f0addb733b..e90cc3a44d 100644
--- a/src/query/src/tvariant.c
+++ b/src/query/src/tvariant.c
@@ -130,6 +130,17 @@ void tVariantDestroy(tVariant *pVar) {
     tfree(pVar->pz);
     pVar->nLen = 0;
   }
+
+  // NOTE: this is only for string array
+  if (pVar->nType == TSDB_DATA_TYPE_ARRAY) {
+    size_t num = taosArrayGetSize(pVar->arr);
+    for(size_t i = 0; i < num; i++) {
+      void* p = taosArrayGetP(pVar->arr, i);
+      free(p);
+    }
+    taosArrayDestroy(pVar->arr);
+    pVar->arr = NULL;
+  }
 }
 
 void tVariantAssign(tVariant *pDst, const tVariant *pSrc) {
@@ -145,6 +156,18 @@ void tVariantAssign(tVariant *pDst, const tVariant *pSrc) {
     
     pDst->pz = calloc(1, len);
     memcpy(pDst->pz, pSrc->pz, len);
+    return;
+  }
+
+  // this is only for string array
+  if (pSrc->nType == TSDB_DATA_TYPE_ARRAY) {
+    size_t num = taosArrayGetSize(pSrc->arr);
+    pDst->arr = taosArrayInit(num, sizeof(char*));
+    for(size_t i = 0; i < num; i++) {
+      char* p = (char*)taosArrayGetP(pSrc->arr, i);
+      char* n = strdup(p);
+      taosArrayPush(pDst->arr, &n);
+    }
   }
 }
 
diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 2357cc892f..eb35be5383 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -1213,7 +1213,9 @@ void filterPrepare(void* expr, void* param) {
   pInfo->compare  = getComparFunc(pSchema->type, pCond->nType, pInfo->optr);
 
   tVariantAssign(&pInfo->q, pCond);
-  tVariantTypeSetType(&pInfo->q, pInfo->sch.type);
+  if (pInfo->optr != TSDB_RELATION_IN) {
+    tVariantTypeSetType(&pInfo->q, pInfo->sch.type);
+  }
 }
 
 int32_t doCompare(const char* f1, const char* f2, int32_t type, size_t size) {
@@ -1327,12 +1329,9 @@ SArray* createTableGroup(SArray* pTableList, STSchema* pTagSchema, SColIndex* pC
   }
   
   if (numOfOrderCols == 0 || size == 1) { // no group by tags clause or only one table
-    size_t num = taosArrayGetSize(pTableList);
-    
-    SArray* sa = taosArrayInit(num, sizeof(SPair));
-    for(int32_t i = 0; i < num; ++i) {
+    SArray* sa = taosArrayInit(size, sizeof(SPair));
+    for(int32_t i = 0; i < size; ++i) {
       STable* pTable = taosArrayGetP(pTableList, i);
-      
       SPair p = {.first = pTable};
       taosArrayPush(sa, &p);
     }
@@ -1358,16 +1357,26 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
 
   STable* pTable = *(STable**)(SL_GET_NODE_DATA((SSkipListNode*)pNode));
 
-  char*  val = dataRowTuple(pTable->tagVal);  // todo not only the first column
+  char*  val = NULL;
   int8_t type = pInfo->sch.type;
+  
+  if (pInfo->colIndex == TSDB_TBNAME_COLUMN_INDEX) {
+    val = pTable->name;
+    type = TSDB_DATA_TYPE_BINARY;
+  } else {
+    val = dataRowTuple(pTable->tagVal);  // todo not only the first column
+  }
 
   int32_t ret = 0;
-  if (pInfo->q.nType == TSDB_DATA_TYPE_BINARY || pInfo->q.nType == TSDB_DATA_TYPE_NCHAR) {
-    ret = pInfo->compare(val, pInfo->q.pz);
+  if (type == TSDB_DATA_TYPE_BINARY || type == TSDB_DATA_TYPE_NCHAR) {
+    if (pInfo->optr == TSDB_RELATION_IN) {
+      ret = pInfo->compare(val, pInfo->q.arr);
+    } else {
+      ret = pInfo->compare(val, pInfo->q.pz);
+    }
   } else {
     tVariant t = {0};
     tVariantCreateFromBinary(&t, val, (uint32_t)pInfo->sch.bytes, type);
-
     ret = pInfo->compare(&t.i64Key, &pInfo->q.i64Key);
   }
 
@@ -1393,6 +1402,9 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
     case TSDB_RELATION_LIKE: {
       return ret == 0;
     }
+    case TSDB_RELATION_IN: {
+      return ret == 1;
+    }
 
     default:
       assert(false);
@@ -1400,6 +1412,7 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
   return true;
 }
 
+
 static int32_t doQueryTableList(STable* pSTable, SArray* pRes, tExprNode* pExpr) {
   // query according to the binary expression
   STSchema* pSchema = pSTable->tagSchema;
@@ -1422,12 +1435,23 @@ static int32_t doQueryTableList(STable* pSTable, SArray* pRes, tExprNode* pExpr)
   tExprTreeDestroy(&pExpr, destroyHelper);
 
   convertQueryResult(pRes, pTableList);
+  taosArrayDestroy(pTableList);
+  free(schema);
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t tsdbQueryByTagsCond(TsdbRepoT* tsdb, int64_t uid, const char* pTagCond, size_t len, STableGroupInfo* pGroupInfo,
-    SColIndex* pColIndex, int32_t numOfCols) {
-  
+
+int32_t tsdbQueryByTagsCond(
+  TsdbRepoT *tsdb,
+  int64_t uid,
+  const char *pTagCond,
+  size_t len,
+  int16_t tagNameRelType,
+  const char* tbnameCond,
+  STableGroupInfo *pGroupInfo,
+  SColIndex *pColIndex,
+  int32_t numOfCols
+) {
   STable* pSTable = tsdbGetTableByUid(tsdbGetMeta(tsdb), uid);
   if (pSTable == NULL) {
     uError("failed to get stable, uid:%" PRIu64, uid);
@@ -1437,31 +1461,35 @@ int32_t tsdbQueryByTagsCond(TsdbRepoT* tsdb, int64_t uid, const char* pTagCond,
   SArray* res = taosArrayInit(8, POINTER_BYTES);
   STSchema* pTagSchema = tsdbGetTableTagSchema(tsdbGetMeta(tsdb), pSTable);
   
-  if (pTagCond == NULL || len == 0) {  // no tags condition, all tables created according to this stable are involved
+  // no tags and tbname condition, all child tables of this stable are involved
+  if (tbnameCond == NULL && (pTagCond == NULL || len == 0)) {
     int32_t ret = getAllTableIdList(tsdb, uid, res);
-    if (ret != TSDB_CODE_SUCCESS) {
-      taosArrayDestroy(res);
-      return ret;
+    if (ret == TSDB_CODE_SUCCESS) {
+      pGroupInfo->numOfTables = taosArrayGetSize(res);
+      pGroupInfo->pGroupList  = createTableGroup(res, pTagSchema, pColIndex, numOfCols);
     }
-  
-    pGroupInfo->numOfTables = taosArrayGetSize(res);
-    pGroupInfo->pGroupList  = createTableGroup(res, pTagSchema, pColIndex, numOfCols);
     taosArrayDestroy(res);
     return ret;
   }
 
-  tExprNode* pExprNode = NULL;
   int32_t    ret = TSDB_CODE_SUCCESS;
 
-  // failed to build expression, no result, return immediately
-  if ((ret = exprTreeFromBinary(pTagCond, len, &pExprNode) != TSDB_CODE_SUCCESS) || (pExprNode == NULL)) {
-    uError("stable:%" PRIu64 ", failed to deserialize expression tree, error exists", uid);
-    taosArrayDestroy(res);
-    return ret;
+  tExprNode* expr = exprTreeFromTableName(tbnameCond);
+  tExprNode* tagExpr = exprTreeFromBinary(pTagCond, len);
+  if (tagExpr != NULL) {
+    if (expr == NULL) {
+      expr = tagExpr;
+    } else {
+      tExprNode* tbnameExpr = expr;
+      expr = calloc(1, sizeof(tExprNode));
+      expr->nodeType = TSQL_NODE_EXPR;
+      expr->_node.optr = tagNameRelType;
+      expr->_node.pLeft = tagExpr;
+      expr->_node.pRight = tbnameExpr;
+    }
   }
 
-  doQueryTableList(pSTable, res, pExprNode);
-  
+  doQueryTableList(pSTable, res, expr);
   pGroupInfo->numOfTables = taosArrayGetSize(res);
   pGroupInfo->pGroupList  = createTableGroup(res, pTagSchema, pColIndex, numOfCols);
 
diff --git a/src/util/inc/tarray.h b/src/util/inc/tarray.h
index 6fab24d51a..dbb74edf07 100644
--- a/src/util/inc/tarray.h
+++ b/src/util/inc/tarray.h
@@ -53,7 +53,7 @@ void* taosArrayPush(SArray* pArray, void* pData);
  *
  * @param pArray
  */
-void taosArrayPop(SArray* pArray);
+void* taosArrayPop(SArray* pArray);
 
 /**
  * get the data from array
@@ -112,6 +112,34 @@ SArray* taosArrayClone(SArray* pSrc);
  */
 void taosArrayDestroy(SArray* pArray);
 
+/**
+ * sort the array
+ * @param pArray
+ * @param compar
+ */
+void taosArraySort(SArray* pArray, int (*compar)(const void*, const void*));
+
+/**
+ * sort string array
+ * @param pArray
+ */
+void taosArraySortString(SArray* pArray);
+
+/**
+ * search the array
+ * @param pArray
+ * @param compar
+ * @param key
+ */
+void* taosArraySearch(const SArray* pArray, int (*compar)(const void*, const void*), const void* key);
+
+/**
+ * search the array
+ * @param pArray
+ * @param key
+ */
+char* taosArraySearchString(const SArray* pArray, const char* key);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/util/inc/tbuffer.h b/src/util/inc/tbuffer.h
index d52031fc6a..9bc0fd9f43 100644
--- a/src/util/inc/tbuffer.h
+++ b/src/util/inc/tbuffer.h
@@ -120,7 +120,7 @@ void  tbufWriteString(SBuffer* buf, const char* str);
 TBUFFER_DEFINE_FUNCTION(bool, Bool)
 TBUFFER_DEFINE_FUNCTION(char, Char)
 TBUFFER_DEFINE_FUNCTION(int8_t, Int8)
-TBUFFER_DEFINE_FUNCTION(uint8_t, Unt8)
+TBUFFER_DEFINE_FUNCTION(uint8_t, Uint8)
 TBUFFER_DEFINE_FUNCTION(int16_t, Int16)
 TBUFFER_DEFINE_FUNCTION(uint16_t, Uint16)
 TBUFFER_DEFINE_FUNCTION(int32_t, Int32)
diff --git a/src/util/src/tarray.c b/src/util/src/tarray.c
index c025958438..51684e767c 100755
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
@@ -27,7 +27,7 @@ void* taosArrayInit(size_t size, size_t elemSize) {
     return NULL;
   }
 
-  pArray->pData = calloc(size, elemSize * size);
+  pArray->pData = calloc(size, elemSize);
   if (pArray->pData == NULL) {
     free(pArray);
     return NULL;
@@ -76,12 +76,14 @@ void* taosArrayPush(SArray* pArray, void* pData) {
   return dst;
 }
 
-void taosArrayPop(SArray* pArray) {
-  if (pArray == NULL || pArray->size == 0) {
-    return;
-  }
+void* taosArrayPop(SArray* pArray) {
+  assert( pArray != NULL );
 
+  if (pArray->size == 0) {
+    return NULL;
+  }
   pArray->size -= 1;
+  return TARRAY_GET_ELEM(pArray, pArray->size);
 }
 
 void* taosArrayGet(const SArray* pArray, size_t index) {
@@ -183,3 +185,40 @@ void taosArrayDestroy(SArray* pArray) {
   free(pArray->pData);
   free(pArray);
 }
+
+void taosArraySort(SArray* pArray, int (*compar)(const void*, const void*)) {
+  assert(pArray != NULL);
+  assert(compar != NULL);
+
+  qsort(pArray->pData, pArray->size, pArray->elemSize, compar);
+}
+
+void* taosArraySearch(const SArray* pArray, int (*compar)(const void*, const void*), const void* key) {
+  assert(pArray != NULL);
+  assert(compar != NULL);
+  assert(key != NULL);
+
+  return bsearch(key, pArray->pData, pArray->size, pArray->elemSize, compar);
+}
+
+static int taosArrayCompareString(const void* a, const void* b) {
+  const char* x = *(const char**)a;
+  const char* y = *(const char**)b;
+  return strcmp(x, y);
+}
+
+void taosArraySortString(SArray* pArray) {
+  assert(pArray != NULL);
+  qsort(pArray->pData, pArray->size, pArray->elemSize, taosArrayCompareString);
+}
+
+char* taosArraySearchString(const SArray* pArray, const char* key) {
+  assert(pArray != NULL);
+  assert(key != NULL);
+
+  void* p = bsearch(&key, pArray->pData, pArray->size, pArray->elemSize, taosArrayCompareString);
+  if (p == NULL) {
+    return NULL;
+  }
+  return *(char**)p;
+}
\ No newline at end of file
diff --git a/src/util/src/tcompare.c b/src/util/src/tcompare.c
index 4505ea533a..4d78a8cf0a 100644
--- a/src/util/src/tcompare.c
+++ b/src/util/src/tcompare.c
@@ -1,42 +1,34 @@
 #include "taosdef.h"
 #include "tcompare.h"
-
+#include <tarray.h>
 #include "tutil.h"
 
 int32_t compareInt32Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT32_VAL(pLeft) - GET_INT32_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
+  int32_t left = GET_INT32_VAL(pLeft), right = GET_INT32_VAL(pRight);
+  if (left > right) return 1;
+  if (left < right) return -1;
+  return 0;
 }
 
 int32_t compareInt64Val(const void *pLeft, const void *pRight) {
-  int64_t ret = GET_INT64_VAL(pLeft) - GET_INT64_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
+  int64_t left = GET_INT64_VAL(pLeft), right = GET_INT64_VAL(pRight);
+  if (left > right) return 1;
+  if (left < right) return -1;
+  return 0;
 }
 
 int32_t compareInt16Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT16_VAL(pLeft) - GET_INT16_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
+  int16_t left = GET_INT16_VAL(pLeft), right = GET_INT16_VAL(pRight);
+  if (left > right) return 1;
+  if (left < right) return -1;
+  return 0;
 }
 
 int32_t compareInt8Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT8_VAL(pLeft) - GET_INT8_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
+  int8_t left = GET_INT8_VAL(pLeft), right = GET_INT8_VAL(pRight);
+  if (left > right) return 1;
+  if (left < right) return -1;
+  return 0;
 }
 
 int32_t compareIntDoubleVal(const void *pLeft, const void *pRight) {
@@ -69,12 +61,7 @@ int32_t compareDoubleVal(const void *pLeft, const void *pRight) {
 }
 
 int32_t compareStrVal(const void *pLeft, const void *pRight) {
-  int32_t ret = strcmp(pLeft, pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
+  return (int32_t)strcmp(pLeft, pRight);
 }
 
 int32_t compareWStrVal(const void *pLeft, const void *pRight) {
@@ -228,6 +215,11 @@ static UNUSED_FUNC int32_t compareStrPatternComp(const void* pLeft, const void*
   return (ret == TSDB_PATTERN_MATCH) ? 0 : 1;
 }
 
+static int32_t compareFindStrInArray(const void* pLeft, const void* pRight) {
+  const SArray* arr = (const SArray*)pRight;
+  return taosArraySearchString(arr, pLeft) == NULL ? 0 : 1;
+}
+
 static UNUSED_FUNC int32_t compareWStrPatternComp(const void* pLeft, const void* pRight) {
   SPatternCompareInfo pInfo = {'%', '_'};
   
@@ -250,7 +242,6 @@ __compar_fn_t getComparFunc(int32_t type, int32_t filterDataType, int32_t optr)
     case TSDB_DATA_TYPE_BIGINT:
     case TSDB_DATA_TYPE_TIMESTAMP: {
 //      assert(type == filterDataType);
-      
       if (filterDataType == TSDB_DATA_TYPE_BIGINT || filterDataType == TSDB_DATA_TYPE_TIMESTAMP) {
         comparFn = compareInt64Val;
       } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
@@ -259,6 +250,7 @@ __compar_fn_t getComparFunc(int32_t type, int32_t filterDataType, int32_t optr)
       
       break;
     }
+
     case TSDB_DATA_TYPE_BOOL: {
       if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
         comparFn = compareInt32Val;
@@ -267,6 +259,7 @@ __compar_fn_t getComparFunc(int32_t type, int32_t filterDataType, int32_t optr)
       }
       break;
     }
+
     case TSDB_DATA_TYPE_FLOAT:
     case TSDB_DATA_TYPE_DOUBLE: {
       if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
@@ -276,12 +269,18 @@ __compar_fn_t getComparFunc(int32_t type, int32_t filterDataType, int32_t optr)
       }
       break;
     }
+
     case TSDB_DATA_TYPE_BINARY: {
-      assert(filterDataType == TSDB_DATA_TYPE_BINARY);
-    
       if (optr == TSDB_RELATION_LIKE) { /* wildcard query using like operator */
+        assert(filterDataType == TSDB_DATA_TYPE_BINARY);
         comparFn = compareStrPatternComp;
+
+      } else if (optr == TSDB_RELATION_IN) {
+        assert(filterDataType == TSDB_DATA_TYPE_ARRAY);
+        comparFn = compareFindStrInArray;
+
       } else { /* normal relational comparFn */
+        assert(filterDataType == TSDB_DATA_TYPE_BINARY);
         comparFn = compareStrVal;
       }
     
diff --git a/tests/pytest/query/__init__.py b/tests/pytest/query/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/pytest/query/tbname.py b/tests/pytest/query/tbname.py
new file mode 100644
index 0000000000..d2799efa25
--- /dev/null
+++ b/tests/pytest/query/tbname.py
@@ -0,0 +1,75 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import taos
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+
+    def run(self):
+        tdSql.prepare()
+
+        tdSql.execute('create table cars (ts timestamp, speed int) tags(id int)')
+        tdSql.execute("create table carzero using cars tags(0)")
+        tdSql.execute("create table carone using cars tags(1)")
+        tdSql.execute("create table cartwo using cars tags(2)")
+
+        tdSql.execute("insert into carzero values(now, 100) carone values(now, 110)")
+
+        tdSql.query("select * from cars where tbname in ('carzero', 'carone')")
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from cars where tbname in ('carzero', 'cartwo')")
+        tdSql.checkRows(1)
+
+        tdSql.query("select * from cars where id=1 or tbname in ('carzero', 'cartwo')")
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from cars where id=1 and tbname in ('carzero', 'cartwo')")
+        tdSql.checkRows(0)
+
+        tdSql.query("select * from cars where id=0 and tbname in ('carzero', 'cartwo')")
+        tdSql.checkRows(1)
+
+        """
+        tdSql.query("select * from cars where tbname like 'car%'")
+        tdSql.checkRows(2)
+
+        tdSql.cursor.execute("use db")
+        tdSql.query("select * from cars where tbname like '%o'")
+        tdSql.checkRows(1)
+
+        tdSql.query("select * from cars where id=1 and tbname like 'car%')
+        tdSql.checkRows(1)
+
+        tdSql.query("select * from cars where id = 1 and tbname like '%o')
+        tdSql.checkRows(0)
+
+        tdSql.query("select * from cars where id = 1 or tbname like '%o')
+        tdSql.checkRows(2)
+        """
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())